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Antioxidants may reduce oxidative stress in men with prostate cancer

Universities of Connecticut, Louisiana State, North Carolina, South Carolina, and California , November 3, 2022

This latest paper – which looked at men with prostate cancer from the North Carolina-Louisiana Prostate Cancer Project – came in light of a growing body of evidence suggesting oxidative stress plays a role in the development and progression of prostate cancer. The researchers looked at biomarkers of oxidative stress in the blood, urine and prostate tissue. 

They found a greater antioxidant intake was associated with lower urinary 8-isoprostane concentrations. 

A 10% increase in antioxidant intake saw an unadjusted 1.1% decrease in urinary 8-isoprostane levels. 

8-Isoprostane has been described as a “reliable marker”  and recognised  “gold standard” for lipid peroxidation – the oxidative degradation of lipids. 

“This study demonstrated that intake of antioxidants was associated with less oxidative stress among men with incident prostate cancer,” the researchers concluded in the British Journal of Nutrition.   

“The results of this study and others warrant additional research in humans on the mechanisms underlying the relationship between dietary antioxidants and prostate tissue redox status and carcinogenesis, as well as determining whether this relationship may influence disease severity, progression and recurrence.” 

High-intensity exercise changes how muscle cells manage calcium 

Karolinska Institute (Sweden) November 2, 2022

Researchers at Karolinska Institutet in Sweden have discovered a cellular mechanism behind the surprising benefits of short, high-intensity interval exercise. Their findings, which are published in the scientific journal PNAS, also provide clues to why antioxidants undermine the effect of endurance training. 

A few minutes of high-intensity interval exercise is enough to produce an effect at least equivalent to that achieved with traditional much more time-consuming endurance training. High-intensity exercise has become popular with sportspeople and recreational joggers alike, as well as with patients with impaired muscle function. However, one question has so far remained unanswered: how can a few minutes’ high-intensity exercise be so effective?

To investigate what happens in muscle cells during high-intensity exercise, the researchers asked male recreational exercisers to do 30 seconds of maximum exertion cycling followed by four minutes of rest, and to repeat the procedure six times. They then took muscle tissue samples from their thighs.

“Our study shows that three minutes of high-intensity exercise breaks down calcium channels in the muscle cells,” says Professor Håkan Westerblad, principal investigator at Karolinska Institutet’s Department of Physiology and Pharmacology. “This causes a lasting change in how the cells handle calcium, and is an excellent signal for adaptation, such as the formation of new mitochondria.”

Mitochondria are like the cell’s power plants, and changes that stimulate the formation of new mitochondria increase muscle endurance. What the researchers found was that the breakdown of calcium channels that was triggered by the high-intensity exercise was caused by an increase in free radicals, which are very reactive and oxidise cellular proteins.

The cells therefore have antioxidative systems for trapping and neutralising the radicals. Antioxidants, like vitamins E and C, are also present in food and are common ingredients in dietary supplements. In the present study, the researchers examined what happens when isolated mouse muscles are treated